TABLE 38. 
Difference of Latitude and Departure for 29° (151°, 209°, 331°). 
In Plane Sailing. 
Forconverting Dep.into Diff. Long.and Diff. Long.into Dep. 
In Middle Latitude Sailing. 
Forconverting Dep.into Diff. Long.and Diff. Long.into Dep. 
In Mercator Sailing. 
For multiplication of numbers by sines and by cosines, or 
solution of plane right-angled triangles. 
